c200k knocking / tapping noise at idle w204 2009

[ukusman]

I have an 2009 w204 c200k. I am getting a tapping knocking noise during idle or when i come to a stop at traffic lights.

The noise can only be heard inside of the vehicle, and mercedes said it was EGR and have replaced it and the noise is still there. The noise doesnt seem to be coomig from the engine it seems to be from under the body somewhere.
Has anyone else experience this ?

thanks in advance

 

[ukusman]

hi, i mainly get the noise when the engine is hot in idle or when i come to a stop at traffic lights. The noise doesnt seem to be there when driving. Im using the Super Unleaded 97 ron or the sell v power 99 ron

 

[ukusman]

Please help guys

 

[Adam230K]

manual or auto?

 

[smoothrider]

hi there, ive been having a similar noise on my W126 300SE auto.
the noise disappeared in P and N, but was quite loud in D and R and also sounded like it was coming from under the car.
I noticed my car was misfiring slightly so got it checked out.
Misfire fixed (mine was due to old valve stem seals leaking into plugs) and noise has gone.